Agilent InfiniiMax III
probing system
Data Sheet
World’s highest speed and highest performing probe system
• Full 30 GHz bandwidth to the probe tip
• Industry’s lowest probe and scope system noise
• Industry’s highest fidelity and accuracy due to
bandwidth and extremely low loading
• Probe amplifiers loaded with measured s-parameters
for more accurate response correction
• Bandwidth upgradable
• Variety of probe heads for different use models with
maximum usability
Unmatched Performance
Industry leading probe bandwidth
The InfiniiMax III probing system offers you the highest
performance available for measuring differential and
single-ended signals, with flexible connectivity solutions for
today’s high-density ICs and circuit boards. Four different
InfiniiMax III probe amplifiers ranging from 16 GHz to 30
GHz are available for matching your probing solution to your
performance and budget requirements. A proprietary 200
GHz fT InP (indium phosphide) IC process with backside
ground vias and novel thick film technology is utilized to
accommodate your highest performance needs and is
unmatched by any product in the market.
Highest fidelity and accuracy
InfiniiMax III provides the highest bandwidth and incredibly
low loading to allow for a new level of signal fidelity and
accuracy. Continuing the probe head topology pioneered by
Agilent in the InfiniiMax I and II probe systems, four new
probe heads are provided to accommodate multiple use
models: an 30 GHz browser that is extremely usable, an
25/28 GHz ZIF probe head with economical replaceable/
removable ZIF tips, an 28 GHz 2.92 mm probe head which
allows cabled measurements using 2.92 mm, 3.5 mm, or
SMA coax cables, and an economical 16/26 GHz solder-in
probe head for demanding measurements.
Uncompromised Usability
More accurate probe correction
Each individual InfiniiMax III probe amplifier contains
its own frequency response data. The 90000-X/Q Series
oscilloscopes download this data and automatically correct
the response of the unique probe system. Traditionally, probe
correction uses a nominal model based on a typical probe
amplifier, not the specific amplifier being used. Generally,
the biggest variation between probing systems is a result
of the probe amplifier. The ability to correct a specific
probe amplifier’s response results in a more accurate probe
correction, which yields a more accurate measurement.
Extensive line-up of probe heads and accessories
Agilent’s InfiniiMax III probes support a wide variety of
high-speed applications with an extensive line-up of probe
heads and accessories.
• N5445A browser head (30 GHz) is the best choice
for general-purpose trouble shooting of differential
signals with z-axis compliance and variable spacing
from 20 mil – 125 mil (or 0.5 mm – 3.1 mm). The span
between the signal tips is easily adjusted with a
thumb wheel on the browser. Integrated LED lighting at
the tip illuminates the probing area for better visibility.
Order N5476A for replacement browser tips (set of 4).
12
9
6
3
0
-3
-6
Correction
No Correction
-9
-12
-15
-18
1E8
1E9
Frequency Hz
1E10
4E10
2
• N5439A ZIF probe head provides 28 GHz bandwidth
in an economical replaceable tip form factor. Because
of their extremely low loading, the ZIF tips can be left
on the DUT as the probe head is moved from one
probing site to the next. Order N5440A (450 Ω
ceramic), N5447A (200 Ω ceramic) or the new N2838A
(450 Ω PC board) for a set of 5 ZIF tips with plastic
sporks to aid in soldering the tips to your DUT.
The N2838A PC board ZIF tip increased the robustness
of the ZIF tip significantly while maintaining the
bandwidth performance up to 25 GHz when used in
conjunction with the N2803A and N5439A. Variable
spacing from 5 mil – 80 mil (or 0.127 mm – 2 mm).
• N5444A 2.92 mm/3.5 mm/SMA probe head (28 GHz)
allows you to connect two 2.92 mm, 3.5 mm or SMA
cables to make a differential measurement on a single
oscilloscope channel. Order N5448A 2.92 mm head flex
cables (10” or 25 cm) to extend the cable length and add
convenience.
The N5444A provides for a termination to a common DC
voltage rather than to ground, which is required for many
signal standards. It is implemented such that from DC to
~1kHz the termination is 55 Ω to the termination voltage,
and above ~10 kHz the termination is 50 Ω to 0.9 times
the termination voltage. The termination voltage range
is ±4 V with a minimum step of 5 mV and a maximum
current of 80 mA. The termination voltage can be
controlled internally by the oscilloscope or applied
externally using the supplied DC jack.
• N5441A solder-in probe head is an economical, semi permanent connection that provides up to 16 GHz
of bandwidth. Variable span of the leads ranges from
5 mil – 80 mil (or 0.127 mm – 2 mm).
3
• N2836A solder-in head provides up to 26 GHz
bandwidth when used in conjunction with the
N2803A probe amplifier.
• N5442A Precision BNC 50 Ω adapter allows you to use
your existing InfiniiMax I (1130A-1134A), InfiniiMax II
(1168A/69A), 1156A-58A active probes or a general
purpose 50 Ω BNC cable with the Infiniium 90000-X
Series oscilloscope.
• N5449A high impedance adapter allows the connection
of probes that require a high impedance scope input
such as a high impedance passive probe, 1147A current
probe, or N2790A differential probe to the Infiniium
90000-X Series oscilloscopes. The N5449A provides
switchable AC/DC coupling as well as 10:1 and 1:1
attenuation settings. The adapter comes with a N2873A
500 MHz 10:1 passive probe.
• N5477A sampling oscilloscope adapter makes the
InfiniiMax III probing system fully compatible with
the Infiniium 86100C DCA-J sampling oscilloscope.
Previously the DCA-J was limited to 13 GHz of probing,
but with the N5477A, the DCA-J now has 30 GHz of
probing, increasing its performance and flexibility.
• N5443A performance verification and deskew fixture
is required to calibrate and verify the performance
of the InfiniiMax III probe. Agilent is currently the only
oscilloscope vendor in the market that provides the
hardware for the customer to validate their high
performance probing system.
Bandwidth upgradeability
As frequencies have continued to increase, so have the cost
of probes. The InfiniiMax III system offers the world’s first
fully upgradeable probe amplifier. Purchase a 16 GHz probe
amplifier today, knowing that in the future, you can upgrade
the amplifier to higher bandwidths (20/25/30 GHz) at a
fraction of the cost of a new probe amplifier.
4
InfiniiMax III probing system family diagram
5
Performance characteristics (of N2803A, 30 GHz probe amplifer, with each probe head)
N2802A: BW=25 GHz, tr=17.4 psec N2801A: BW=20 GHz, tr=21.7 psec N2800A: BW=16 GHz, tr=27.1 psec
N2803A with
N5439A and
N5447A (Ceramic
ZIF 200Ω)
Probe bandwidth (-3dB),
probe only
Rise and fall time, probe only 20.9 psec (10-90%),
System bandwidth (-3dB)
with DSO/DSAX93204A
Rise and fall time with
DSO/DSAX93204A
Input capacitance Cdiff=32fF, Cse=44fF/ Cdiff=32fF,Cse=44fF/
DC input resistance* Rdiff=50 kΩ ±2%,
Input resistance >10 kHz Rdiff=500 Ω,
Input voltage range
(differential or single-ended)
28 GHz (typical) 28 GHz (typical),
13.8 psec (20-80%)
28 GHz 28 GHz/25 GHz 30 GHz 16 GHz /26 GHz 28 GHz
15.5 psec (10-90%)
11.0 psec (20-80%)
Rse=25 kΩ ±2%
Rse=250 Ω
0.8Vpp, ±0.4V
(HD2&3 <-38db),
1.6Vpp, ±0.8V
(HD2&3<-34db)**
N2803A with
N5439A and N5440A
(Ceramic ZIF 450Ω)
/N2838A (PCB
ZIF 450 Ω)
26 GHz* (warranted)
/25 GHz (typical)
20.9 psec (10-90%),
13.8 psec (20-80%)/
23.1 psec (10-90%)
14.9 psec (20-80%)
15.5 psec (10-90%)
11.0 psec (20-80%)/
17.6 psec (10-90%)
12.5 psec (20-80%)
Cdiff=95 fF, Cse=130 fF
N2803A with
N5445A (browser)
30 GHz (typical),
28 GHz* (warranted)
16.2 psec (10-90%),
10.9 psec (20-80%)
14.3 psec (10-90%)
10.2 psec (20-80%)
Cdiff=35fF, Cse=50fF Cdiff=77fF, Cse=105fF/
Rdiff=100 kΩ ±2%, Rse=50 kΩ ±2% 55 Ω to Vterm
Rdiff=1 kΩ Rse=500 Ω 50 Ω to 0.909x Vterm
1.6Vpp, ±0.8V (HD2&3 <-38db),
2.5Vpp, ±1.25V (HD2&3<-34db)**
N2803A with N5441A
(16 GHz solder-in)/
N2836A (26 GHz
solder-in)
17.2 GHz (typical)/
27 GHz (typical)
34.8 psec (10-90%),
26.6 psec (20-80%)/
21.1 psec (10-90%)
13.8 psec (20-80%)
27.1 psec (10-90%)
19.2 psec (20-80%)/
16.5 psec (10-90%)
11.7 psec (20-80%)
Cdiff=108 fF, Cse=140 fF
N2803A with N5444A
(SMA adapter)
28 GHz
18.8 psec (10-90%),
12.7 psec (20-80%)
15.5 psec (10-90%)
11.0 psec (20-80%)
N/A
2.5 Vrms
Input common mode range ±6V DC to 250Hz
±1.25V > 250Hz
DC attenuation ratio 3:1 6:1
Offset range ±16V when probing a single-ended signal ±16V when probing
Noise referenced to input,
probe only
Maximum input voltage 18V peak CAT I Same as input voltage
* Denotes warranted characteristic. All others are typical.
** Harmonic distortion < -38dB is standard; < -34dB wider input range with slightly increased distortion
2mVrms 4mVrms
±12V DC to 250Hz
±2.5V > 250Hz
±12V DC to 250Hz
±2.5V > 250Hz (must
not exceed max input
voltage)
a single-ended signal
(must not exceed max
input voltage)
range
6
Ordering Information
InfiniiMax III probe amplifier models
Model Number Description Recommended oscilloscope
N2803A 30 GHz InfiniiMax III probe amplifier Infiniium 90000X/Q Series 28 GHz - 63 GHz models
N2802A 25 GHz InfiniiMax III probe amplifier Infiniium 90000X/Q Series 25 GHz models
N2801A 20 GHz InfiniiMax III probe amplifier Infiniium 90000X/Q Series 20 GHz models
N2800A 16 GHz InfiniiMax III probe amplifier Infiniium 90000X Series 16 GHz models
Note: N2800A-N2803A InfiniiMax probe amps are not compatible with existing InfiniiMax I or II probe heads.
InfiniiMax III probe heads
Model Number Description Notes
N5445A InfiniiMax III browser head Order N5476A for replacement probe tips (set of 4)
N5439A InfiniiMax III ZIF probe head Order N2838A PC board ZIF (450 Ω), N5440A Ceramic ZIF
(450 Ω) or N5447A Ceramic ZIF (200 Ω) for a set of 5 ZIF
tips with plastic sporks.
N5444A InfiniiMax III 2.92 mm/3.5 mm/SMA probe head Order N5448A 2.92 mm head flex cables to extend the
cable length.
N5441A InfiniiMax lll 16 GHz solder-in probe head
N2836A InfiniiMax III 26 GHz solder-in probe head
Note: N54xxA InfiniiMax III probe heads are not compatible with InfiniiMax I or II probe amps.
InfiniiMax III probe adapters
Model Number Description Notes
N5442A Precision BNC adapter (50 Ω) For use with InfiniiMax I and II probes, 1156A-58A etc.
N5449A High impedance probe adapter Includes one N2873A 500MHz 10:1 passive probe
N5477A Sampling scope adapter For use with Agilent 86100C DCA-J sampling scope
N5443A Performance verification and deskew fixture
Probe bandwidth upgrade options
Model Number Description Notes
N5446A 16 GHz to 20 GHz bandwidth upgrade
N5446B 20 GHz to 25 GHz bandwidth upgrade
N5446C 25 GHz to 30 GHz bandwidth upgrade
Note: Purchase two or more upgrade options to go from 16 to 25 or 30 GHz and 20 to 30 GHz. To upgrade the probe bandwidth, you simply need to send the
probe to the Agilent service center.
Other recommended accessories for InfiniiMax III probing system
Model Number Description Notes
N2787A 3D probe positioner For hands-free probing
N2812A High performance input cable, 2.92 mm
connectors, 1 m length
MV-23 Carson Optical MagniVisor
Note: Purchase two or more upgrade options to go from 16 to 25 or 30 GHz and 20 to 30 GHz.
For use with Infiniium 90000-X/Q Series oscilloscope
www.carsonoptical.com/Magnifiers
7
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Revised: January 6, 2012
Product specifications and descriptions
in this document subject to change
without notice.
© Agilent Technologies, Inc. 2012
Published in USA, August 6, 2012
5990-5653EN
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